In the default setting, knitr will use "'pdf' for LaTeX output and 'png' for HTML/markdown". However, I can specify the dev = "png" in the chunk options for the LaTeX output. This feature is very useful to reduce the file size for big vector figure (e.g. maps).
In the previous version of knitr (could be 1.8.*, but not sure), I can specify the dev = "png" (the example below is working for earlier version).
Today I installed the latest version of knitr from github (just now). But the dev='png' is not working for pdf output. I have to use png device for pdf output as I have some big vector figure in pdf format.
The error message is:
Error in (function (filename = "Rplot%03d.png", width = 480, height = 480, :
unused argument (pdf = list(useDingbats = FALSE) Call: <Anonymous> ...
block_exec -> chunk_device -> dev_new -> do.call -> <Anonymous> Execution halted))
How could I fix this problem?
This is my example:
---
output: pdf_document
---
```{r, echo=FALSE, dev='png'}
plot(cars)
```
Thanks for any advice. Please let me know if my question is still not clear.
This is my session information.
R version 3.1.3 (2015-03-09)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 7 x64 (build 7601) Service Pack 1
locale:
[1] LC_COLLATE=English_Australia.1252 LC_CTYPE=English_Australia.1252 LC_MONETARY=English_Australia.1252
[4] LC_NUMERIC=C LC_TIME=English_Australia.1252
attached base packages:
[1] stats graphics grDevices utils datasets methods base
other attached packages:
[1] knitr_1.9.4
loaded via a namespace (and not attached):
[1] digest_0.6.4 evaluate_0.5.5 formatR_1.0 htmltools_0.2.6 rmarkdown_0.5.1 stringr_0.6.2
[7] tools_3.1.3 yaml_2.1.13
dev='png' [to "work"] for pdf. What would the verb "work" mean in this context? – IRTFM